Pacdrive C400

Hi all,
Just been given a task of modifiying the program in a Pacdrive C400 controller, (a new one on me).
According to Google, the original manufacturer was a German Company ELAU, who have subsequently been obtained by Schneider. It would appear the programming software was EPAS-4, but there is no reference to this on the Schneider website and I can't find any definative answer to the programming package I need to obtain to be able to view/modify the program.
Any info would be appreciated.
Steve